Abstract: In view of the serious situations of drought, water shortage, seawater intrusion and land productivity decline in Laizhou Bay area of China, exemplary experimental studies of farmland ecological engineering were carried out in Laizhou and Shouguang. The ecological engineering mainly included the techniques of the selection of improved varieties, crop structure adjustment, rotation and intercropping, plastic film covering, water saving irrigation, soil fertilization and crop tree intercropping, which gave a remarkable ecological and economical benefit. Based on this, the exemplary models on controlling the disaster of seawater intrusion and on realizing the sustainable development of agriculture were set up.

Key words: Seawater intrusion, Farmland ecological engineering, Laizhou Bay area, light quality, tomato, chlorophyll fluorescence, photosynthetic pigment content, photosynthetic characteristics